In this Thursday, June 27, 2013 photo, Princeton University graduate student Manu Mannoor holds a bionic ear as another is printed on a 3-D printer in Princeton, N.J. Mannoor is one of the scientists at Princeton University who have created an ear with an off-the-shelf 3-D printer that can "hear" radio frequencies far beyond the range of normal human capability. The researchers used 3-D printing of cells and nanoparticles followed by cell culture to combine a small coil antenna with cartilage, creating what they term a bionic ear. (AP Photo/Mel Evans)
In this Thursday, June 27, 2013 photo, a bionic ear rests in a petri dish, in Princeton, N.J. Scientists at Princeton University have created an ear with an off-the-shelf 3-D printer that can "hear" radio frequencies far beyond the range of normal human capability. The researchers used 3-D printing of cells and nanoparticles followed by cell culture to combine a small coil antenna with cartilage, creating what they term a bionic ear. (AP Photo/Mel Evans)
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